Furnace-grate.



WITNESSES H. B. EE-L-LS.

FURNACE GRATE.

APPLICATION FILED JUNE 12. 1914.

Patented July 27, 1915.

4 SHEETS-SHEET 1.

I/VVE/V TOR Henry B. Eells,

H. B. EELLSQ FURNACE GRATE.

APPLICATION FILEDJUNE 12, I914.

1,148,159. Patented 2 15.

4 SH SH mum s:

WITNESSES 3 5 IN l/E/V TOR I Henry B. E e/1;,

- 71 TTORNEY H. B. EELLS.

FURNACE GRATE.

APPLICATION FILED JUNE 12. 1914.

Patented July 27, 1915.

IN V E N TOR HenryB. E 11s,

- WITNESSES an XAWLM.

AIT'ORNEV H. B. EELLS.

FURNACE GRATE.

APPLICATION FILED JUNE 12, 1914.

1, M8, 1 59, Patented July 27, 1915.

4 SHEETSSHEET 4.

WITNESSES INVENTOR HenzyB. 811s,

WMTEE STATES PATENT @FFTQ HENRY B. EELLS, OF NEW YORK, N. Y.

Bonuses-enema.

Specification of Letters Patent.

PatentedJuly at, 1915.

Application filed June 12, 1914. Serial No. 844,623.

' to provide a grate structure in which the dumping elements of the grate shall be relatively large in size so as to be capable of effectuall dumping the fire and breaking up all c inkers and to so construct the parts as to prevent Warping and twisting of the grate sections.

Other objects are to facilitate theready removal and replacement of the grate sections and in general to increase the efficiency, decrease the cost and to simplify the construction.

These objects I have attained by constructing the grate with a plurality of socalled dumping grate elements made up each in the form of a pivoted cradle dis-.

posed below the fire line and supporting a plurality of rows of grate sections constituting the support for the fire bed, which sections while relatively fixed on the cradle are independently removable therefrom.

This construction protects the cradle from warping or overheating and the making of the grate sections in a plurality of rows of sections provides a dumping element of sufficient size to break up and dump any clinkers that may form and one whose individual units or sections are small enough notfto be injuriously warped by the heat and to be readily and economically replaceable.

Special features of the invention reside in the improved construction of cradle and grate sections and locking means for securing thegrate sections upon the cradle. This consists in brief in making the grate sections with hooked portions which when said sections are shifted upon the cradle engage with lugs provided for the purpose on the cradle and providing locking keys which are inserti'ole into sockets in the cradle to hold the adjacent ones of the grate sections in their shifted interlocked relation.

Various other features of the invention will appear as the specification proceeds.

The accompanying drawings illustrate a practical embodiment'of the invention but it will be understood that various changes and modifications may be made from this showing without departing from the true spirit and scope of the invention.

Figure 1,' is a perspective View'of a furnace grate embodying the invention. Fig. 2, is a broken side viewof the grate-structure, partly in section, showing one of the dumping elements rocked to dumping position and another element in its normal ition. Fig. 3, is a plan view of one o the grate elements with a grate section removed from one of the rows of sections and a SBC', tion in another row in position ready to be shifted into interlocked engagement with the lugs on the cradle. Fig. 4, is a vertical cross sectional view of one of the grate elements taken substantiallyv on the plane of line 4.--4 in Fig. 5, showing a grate section in one row about to be engaged with the cradle and showing in dotted lines this-section engaged and the locking key in place. Fig. 5, is a vertical sectional view of a grate element, taken substantially on the plane of the line 5-5 in Fig. 3. Fig. 6, is a perspective view of oneof the grate sections. Fig. 7 is 'a similar view of one of the locking keys. The furnace grate illustrated is made up of six grate elements, numbered 11, 12, 13, 14, 15 and 16. These elements are supported on bearers or supporting bars 17 suitably engaged with the brickwork or body 18 of the furnace.

The so-called cradles which. carry the grate sections, are designated 20 and are here in the form of rectangular open frames having front and rear end bars21,connected by the side bars 22. The end bars are connected intermediate their ends by cross bars 23 disposed parallel to the side bars and the frame is further reinforced by struts 24 connected between the side bars. Extending substantially along the center of the frame is a pair of bars25, s aced apart to form between them sockets or the locking keys. The pivotal mounting of the frame is accomplished by providing pintles 26 on the sides of the frame to engage in corresponding bearings 27 in the bearers 17 T he cm- 7 dle frame is further provided with. inwardly extending supporting lugs 29 disposed at the corners of the frame, similar lugs .30 at the points of intersection of the intermediate cross bars with the end barsand lugs 31 atintermediate points in the length of the side bars and cross bars. These lugs have inwardly and downwardly inclined upper supporting surfaces 32 sand abrupt lower locking faces 33.

The grate sections 35 are made with openings or passages of the proper size and shape to pass the necessary amount of air without impairing their fuel-supporting ability and they are made relatively small so that under heat they will not warp or grow to any detrimental extent. In the form shown the air passages 36 are provided by making the fuel supporting surface up of diagonally disposed spaced bars 37. While the grate sections or units are in themselves relatively small, the dumping elements are maderelatively large so as to be capable of breaking up and affording passage for any clinkers that may form.

The dumping elements are therefore con-' structed with grate sections disposed in a plurality of rows. In the illustration (see particularly Fig. 1) there are two such rows of grate sections, with the-sections in a row arranged side by side and the sections in the respective rows disposed opposite each other in end to end relation.

The grate sections are supported on the cradle by seating them on the supporting lugs 29, 30 and 31. The said sections are for this purpose shown provided with dependent ribs 38 at the side edges thereof having inclined under faces 39 forming shoulders riding on the inclined supporting faces 32 of. the lugs. This-prevents sidewise shifting of the sections. The sections are furthermore providedwith hooked portions 40 which by engaging beneath the under faces 33 of the lugs serve to secure the sections on thecradle. There are four of these hooks on each section, formed, in the illustration,

as dependent portions of transverse ribs 41, one of which is located at one end and theother at an intermediate portion of each grate section. The interlocking of the grate ward into final position. This longitudinal sliding movement carries the hooked portions beneath the lugs, as will be evident froniFig. 4 and so secures the section against displacement from the cradle. The outward sliding movement of the section is limited by the outermost hooked portion engaging with the end bar 21 of the cradle frame and by then securing the section against inward shifting movement the section-is held in interlocked relation.

The means for securing the grate sections in their interlocked position, in the illustration,.takes the form of keys 45 which are interposed between the opposing sections of adjoining rows. these keys fit in the spaces between the ends of the sections and so hold the sections in their spaced apart relation interlocked with the cradle. The shank portions 47 of the keys seat in the sockets formed between the spaced frame bars 25. Shoulder lugs 48 formed on the sides of the keys rest on top of the bars 25 and pins 49 are usually passed through openings 50 in the keys beneath the bars 25 to prevent accidental displacement of the keys. i

The grate sections are usually formed with notched or toothed edges, such as indicated, to provide air spaces between the sectionsand at the same time afford proper support for the fuel bed. The keys are preferably made to correspond in shape to the notched edges of the grate sections and they are usually made slightly smaller than used in whatever part of the grate they are required.

Suitable means may be provided for dumping the grate elements either singly or in any number. two foremost grate elements dump together, and the rear element is independently operated. The two foremost elements 11 and 12 are therefore connected together by a conpler 60 engaged with the dependent lever arms 61 on the two cradles to which there is connected an operating rod 62, while the rear grate element 13 is operated by a rod 63 connected by a fork Get with the dependent lever arm on the cradle of that element.

From the foregoing it will be apparent that a grate constructed in accordance with and embodying my invention possesses all the advantages due to relatively large dumping elements but without the disadvantages as to warping, expense of replacement, etc., ordinarily incidental to such grates, and that the grate sections while constructed to withstand great wear, can very easily be re-' placed whenever required. The securing of a number of the grate sections in place by a single key will also be seen to be a considerable advantage 'in that fewer securing devices are necessary and a number of the sec- The head portions 46 of In the illustration the posed below the fire line,a series of grate iilOIlS can be released or secured by operatmg a single securing device. It will be noted furthermore that the cradle, lying as it does wholly below the fire level is protected from warping and undue heating.

What I claim'is:. 1. In a furnace grate, a pivoted cradle dissections supported side by side in a row on said cradle, a second series of grate sections supported side by side in a row alongside the first row and with the ends of the sections in said second row adjoining the ends of the sections in the first row, said grate sections being disposed on the fire line and forming the support for .the fire-bed---and keying.

means inserted between adjoining grate sections securing the grate sections onthe cradle and'forming the support for the fire bed between said grate sections.

2. In a furnace grate, an open cradle frame having side and end bars and provided with inwardly projecting sup-porting lugs at the corners of the side and end bars and grate sections resting on the said lugs and provided with hooked portions engaging beneath the said lugs.

3. In a furnace grate, a cradle frame provided with lugs and with sockets between certain of the lugs, a plurality of rows of; grate sections supported on the cradle, said sections having hooked portions arranged as the grate sections are shifted on the cradle to be engaged beneath the lugs and keying means inserted between adjoininggrate sections into engagement in the-sockets in the cradle and engaging the said adjoining grate sections to thereby secure said gr'ate .sec-

tions in shifted position on the cradle with the hooked portions thereof interlocked with the lugs.

4. As an article of manufacture, an open cradle frame having side and end bars, wlth inwardly projecting sup-porting lugs at the corners of the side and end bars and provided with a key socket intermediate the ends of the side bars.

In a furnace grate, a supporting-cradle, grate sections having hooked portions interlocking with the cradle by a lengthwise resting on said lugs and provided with hooked portions arranged to interlock beneath the supporting lugs when said sections are shifted onthe cradle in oppositedirections, and a key inserted between the grate sections to thereby hold said sections in their shifted interlocked positions.

- 8. In a furnace grate, a cradle frame provided with 'supporting lugs, grate sections arranged in rows and resting on the supporting lugs, the said grate sections having hooked portions arranged tobe engaged beneath the supporting lugs by the shifting movement of the sections of the respective rows away from each other and keying means inserted between the sections of the respective rows tothere'by maintain the sec tions in shifted interlocked position.

9. In a furnace grate; a cradle frame provided with supporting lugs, grate sections arranged in rows and resting on the supporting lugs, the said grate sections having hooked portions arranged to be engaged beneath the supporting lugs by the shifting 'movement of the sections of the respective rows aways from each other, the sections in one row being disposed opposite the sections in the adjoining row and a key inserted between oppositely disposed grate sections in adjoining rows to: thereby secure said two grate sections in shifted position interlocked with the supporting lugs.

10. In a furnace grate, a cradle frame provided with lugs, grate sections having opposing faces of toothed configuration and provided with hooked portions engaging beneath the lugs and a key inserted between the .grate sections and conforming to the...

toothedconfiguration of the opposing faces thereof.

11. In a furnace grate, a cradle frame provided with lugs, a grate sectionprovided with dependent hooked portions arranged to pass down at one side of said lugs as the grate section is rested on the cradle and to 'be carried beneath the lugs as said section is shifted on the cradle and a key engaging V the cradle frame and holding the grate section in its shifted interlocked position on the cradle.

12. In a furnace grate, a cradle frame provided with lugs, a grate section provided with dependent hooked portions arranged to pass down at one side of said lugs as the grate section is rested on the cradle and to be carried beneath the lugs as said section is'shiftedon the cradle, the said cradle being provided with a socket disposed adjacent the end of the section in itsshifted position and a key inserted in the socket and engaging the grate section to thereby hold it in interlocked position.

13. In a furnace grate, a cradle for supporting the grate sections, said cradle being provided with lugs and with a socket disposed in a plane between adjacent grate sections, grate sections on the cradle pro- Vided with hooked portions to interlock beneath the lugs and a key insertible in the socket between the sections.

l-l. In a furnace grate, a cradle for supporting the grate sections, said cradle provided with lugs, grate sections supported on the cradle and provided with hooked portions arranged to be carried by the shifting of the sections into engagement, beneath the lugs and a key engaging the sections to hold them in their shifted interlocked position.

15. In a furnace grate, an open cradle frame having side and end bars and provided with inwardly projecting supporting lugs at the corners of the side and end bars and at points intermediate the ends of the side bars and grate sections resting on the said lugs and. provided with hooked portions engaging beneath the said lugs.

16. In a furnace grate, an open cradle frame having side and end bars and providedwith inwardly projecting supporting lugs at the corners of the sideand end bars and at points intermediate the ends of the side bars and grate sections resting on the said lugs and provided with hooked portions engaging beneath the said lugs, the cradle frame being provided with a socket located in a plane between the grate sections and a locking keyinsertible in the said socket.

17. As an article of manufacture, an open cradle frame having side and end bars, with inwardly projecting supporting lugs at the corners of the side and end bars and on the side bars at points intermediate the ends of the same and provided with a key socket intermediate the ends of the side bars.

18. As an article of manufacture, an open cradle frame having side and end bars, in-

termediate cross bars extending between the end bars parallel to the side bars and inwardly projecting lugs at the corners of the frame, at the junctions of the end and intermediate bars and at intermediate points in the length of the side and intermediate bars.

end bars parallel to the side bars, inwardly projecting lugs at the corners of the frame,

at the junctions of the end and intermediate bars and at intermediate points in the length of the side and intermediate bars and bars extending between the side bars parallel to the end bars, spaced apart to provide sockets therebetween.

20. As an article of manufacture, an open cradle frame having side and end bars with inwardly projecting supporting lugs at the corners of the side and end bars and on the side bars at points intermediate the endsof the same and bars extending between the side bars parallel to the end bars, spacedapart to provide sockets therebetween.

21. In a furnace grate, a cradle frame having side and end bars, inwardly projecting lugs and spaced bars extending between the side bars, grate sections resting on the cradle and provided with hooked portions engaging'beneath the lugs, a locking key insertible between the grate sections and having a part projecting down between the spaced bars and a securing pin engaging the projecting part of the locking key.

22. In a furnace grate, a cradle frame having supporting lugs extending inwardly into the frame, provided with inwardly and downwardly inclined upper supporting surfaces and abrupt under surfaces and a grate section having correspondingly inclined surfaces resting on the upper supporting surfaces of the lugs and hook portions spaced below said inclined surfaces engaging beneath the abrupt under surfaces of the lugs.

23, As an article of manufacture, a grate section comprising a perforated body forming a support for the fuel bed having serrated edges and provided with two dependent outwardly projecting and oppositely extending hooks adjacent each end thereof, and with supporting shoulders above said hooks.

24. As an article of manufacture, an open cradle frame having side and end bars with inwardly projecting supporting lugs at the corners of theside and end bars and on the side bars at points intermediatethe ends of E. W. MCGUIRE, PHILIP S. MGGEAN. 

